Rectangle, Represents an Entity (e.g., Student, Course, Teacher), Ellipse / Oval, Represents an Attribute (properties or characteristics of an entity), Diamond, Represents a Relationship between entities, Double Ellipse, Represents a Multivalued Attribute (e.g., multiple phone numbers), Dashed Ellipse, Represents a Derived Attribute (calculated value, e.g., Age derived from Date of Birth), Underlined Attribute, Represents the Primary Key (a unique identifier for an entity), Double Rectangle, Represents a Weak Entity (an entity that depends on another entity), One-to-One (1:1), A citizen has one citizen ID, and one ID belongs to one citizen, One-to-Many (1:N), One teacher teaches many students in a department, Many-to-Many (M:N), Many students can enroll in many courses
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